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271.

OpenBoot provides the basic functions needed to boot the &arch-title; architecture. This is rather similar in function to the BIOS in the x86 architecture, although much nicer. The Sun boot PROMs have a built-in forth interpreter which lets you do quite a number of things with your machine, such as diagnostics and simple scripts.

272.

To get to the boot prompt you need to hold down the <keycap>Stop</keycap> key (on older type 4 keyboards, use the <keycap>L1</keycap> key, if you have a PC keyboard adapter, use the <keycap>Break</keycap> key) and press the <keycap>A</keycap> key. The boot PROM will give you a prompt, either <userinput>ok</userinput> or <userinput>&gt;</userinput>. It is preferred to have the <userinput>ok</userinput> prompt. So if you get the old style prompt, hit the <keycap>n</keycap> key to get the new style prompt.

273.

If you are using a serial console, send a break to the machine. With Minicom, use <keycap>Ctrl-A F</keycap>, with cu, hit <keycap>Enter</keycap>, then type <userinput>%~break</userinput>. Consult the documentation of your terminal emulator if you are using a different program.

274.

You can use OpenBoot to boot from specific devices, and also to change your default boot device. However, you need to know some details about how OpenBoot names devices; it's considerably different from Linux device naming, described in <xref linkend="device-names"/>. Also, the command will vary a bit, depending on what version of OpenBoot you have. More information about OpenBoot can be found in the <ulink url="&url-openboot;">Sun OpenBoot Reference</ulink>.

275.

Typically, with newer revisions, you can use OpenBoot devices such as <quote>floppy</quote>, <quote>cdrom</quote>, <quote>net</quote>, <quote>disk</quote>, or <quote>disk2</quote>. These have the obvious meanings; the <quote>net</quote> device is for booting from the network. Additionally, the device name can specify a particular partition of a disk, such as <quote>disk2:a</quote> to boot disk2, first partition. Full OpenBoot device names have the form: <informalexample> <screen>
<replaceable>driver-name</replaceable>@
<replaceable>unit-address</replaceable>:
<replaceable>device-arguments</replaceable>
</screen></informalexample> In older revisions of OpenBoot, device naming is a bit different: the floppy device is called <quote>/fd</quote>, and SCSI disk devices are of the form <quote>sd(<replaceable>controller</replaceable>, <replaceable>disk-target-id</replaceable>, <replaceable>disk-lun</replaceable>)</quote>. The command <userinput>show-devs</userinput> in newer OpenBoot revisions is useful for viewing the currently configured devices. For full information, whatever your revision, see the <ulink url="&url-openboot;">Sun OpenBoot Reference</ulink>.

276.

To boot from a specific device, use the command <userinput>boot <replaceable>device</replaceable></userinput>. You can set this behavior as the default using the <userinput>setenv</userinput> command. However, the name of the variable to set changed between OpenBoot revisions. In OpenBoot 1.x, use the command <userinput>setenv boot-from <replaceable>device</replaceable></userinput>. In later revisions of OpenBoot, use the command <userinput>setenv boot-device <replaceable>device</replaceable></userinput>. Note, this is also configurable using the <command>eeprom</command> command on Solaris, or modifying the appropriate files in <filename>/proc/openprom/options/</filename>, for example under Linux: <informalexample><screen>
# echo disk1:1 &gt; /proc/openprom/options/boot-device
</screen></informalexample> and under Solaris:

277.

eeprom boot-device=disk1:1

278.

BIOS Setup

279.

In order to install &debian; on a &arch-title; or zSeries machine you have first boot a kernel into the system. The boot mechanism of this platform is inherently different to other ones, especially from PC-like systems: there are no floppy devices available at all. You will notice another big difference while you work with this platform: most (if not all) of the time you will work remote, with the help of some client session software like telnet, or a browser. This is due to that special system architecture where the 3215/3270 console is line-based instead of character-based.

280.

Linux on this platform runs either natively on the bare machine, in a so-called LPAR (Logical Partition) or in a virtual machine supplied by the VM system. You can use a boot tape on all of those systems; you may use some other boot media, too, but those may not be generally available. For example, you can use the virtual card reader of a virtual machine, or boot from the HMC (Hardware Management Console) of an LPAR if the HMC and this option is available for you.